{"gene":"CD96","run_date":"2026-04-28T17:28:52","timeline":{"discoveries":[{"year":2014,"finding":"CD96 competes with CD226 (DNAM-1) for CD155 binding and limits NK cell function by direct inhibition, acting as an inhibitory receptor that opposes CD226-mediated NK cell cytotoxicity and cytokine production.","method":"Cd96-/- mouse model with LPS challenge and experimental metastasis models; binding competition assays; NK cell functional assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with defined cellular phenotype plus direct binding competition assay; independently replicated across multiple experimental contexts","pmids":["24658051"],"is_preprint":false},{"year":2008,"finding":"CD96 interacts with its ligands CD155 (PVR) and nectin-1 via its outermost V-like (first Ig-like) domain; the interaction is modulated by the nature of the second and third downstream Ig domains, including by alternative splicing generating two human splice variants and by a disease-associated missense mutation (T280M in the third domain) that reduces CD155 binding.","method":"Chimeric human/murine CD96 receptor constructs; binding assays; splice variant characterization across cell types; functional mutation analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — domain-mapping with chimeric receptors plus mutational analysis; multiple orthogonal methods in one study","pmids":["19056733"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of CD96 first Ig domain (D1) bound to nectin-like protein-5 (CD155/necl-5) revealed that CD96 recognizes CD155-D1 via a conserved 'lock-and-key' interaction and a novel 'ancillary key' structural motif unique to CD96 that confers specific necl-5 recognition. CD96-D1 is sufficient to mediate robust interaction with necl-5 but not nectin-2.","method":"X-ray crystallography; mutational analysis; binding assays","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional mutational validation in a single rigorous study","pmids":["30528596"],"is_preprint":false},{"year":2007,"finding":"CD96 mutations cause a form of the C (Opitz trigonocephaly) syndrome; a disease-associated missense mutation (T280M) in CD96 caused loss of cell adhesion and growth activities in vitro, indicating CD96 mediates cell adhesion and growth through its extracellular domain.","method":"Human genetic mutation analysis; in vitro cell adhesion and growth assays with mutant CD96 protein","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2-3 — human genetic findings linked to in vitro functional assay; single lab, single functional readout","pmids":["17847009"],"is_preprint":false},{"year":2019,"finding":"Human nectin-1 directly interacts with human CD96 in vitro; the binding site is on the nectin-1 V-domain at the canonical nectin-nectin interface, with affinity comparable to nectin-1 binding to HSV glycoprotein D but lower than CD96's affinity for CD155. Overexpression of nectin-1 on K562 cells increased susceptibility to NK-92 cytotoxicity.","method":"In vitro binding assay; affinity measurements; K562 cell overexpression and NK cytotoxicity assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — direct in vitro binding reconstitution with affinity quantification and functional cell assay; single lab","pmids":["30759143"],"is_preprint":false},{"year":2019,"finding":"CD96 functions as an immune checkpoint on CD8+ T cells; CD96-deficient CD8+ T cells promoted greater tumor control than CD96-sufficient cells, and this depended on CD226 (DNAM-1), Batf3, IL-12p35, and IFNγ, placing CD96 inhibition upstream of these factors in CD8+ T cell anti-tumor responses.","method":"Cd96-/- mouse models; tumor challenge experiments with CD8+ T cell-specific depletion; genetic epistasis with Cd226-/-, Batf3-/-, and cytokine-deficient mice","journal":"Cancer immunology research","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO with defined cellular phenotype and multiple epistasis experiments; replicated across several tumor models","pmids":["30894377"],"is_preprint":false},{"year":2020,"finding":"CD96 has co-stimulatory function on CD8+ T cells: crosslinking CD96 on human or mouse CD8+ T cells induced activation, effector cytokine production, and proliferation via the MEK-ERK signaling pathway, and increased NUR77- and T-bet-expressing CD8+ T cells. Antibody blockade or genetic ablation of CD96 on CD8+ T cells impaired transcription factor and cytokine expression in vivo.","method":"CD96 crosslinking assay; pharmacological MEK-ERK pathway inhibition; Cd96-/- mice in vivo; flow cytometry for NUR77, T-bet, cytokines","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (crosslinking, pathway inhibition, genetic ablation) in single lab; some apparent contradiction with inhibitory role in NK cells","pmids":["32043568"],"is_preprint":false},{"year":2018,"finding":"CD96 expression marks functionally distinct CD8+ T cell subsets: CD96-negative CD8+ T cells represent a population producing both perforin and IFNγ upon stimulation; LPS decreases CD96 expression on CD8+ T cells in vitro, linking inflammatory signals to CD96 downregulation and altered effector function.","method":"Flow cytometry; intracellular cytokine/perforin staining; in vitro LPS stimulation","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 — single-method association between CD96 expression and effector function; no direct mechanistic manipulation","pmids":["23272144"],"is_preprint":false},{"year":2018,"finding":"CD96 expression in Th9 cells acts as an inhibitory co-signaling receptor: CD96-low Th9 cells displayed greater IL-9 production, enhanced expansion, tissue accumulation, and inflammatory potential (causing colitis in Rag1-/- recipients), while CD96-high Th9 cells were less inflammatory. Blockade of CD96 restored expansion and inflammatory properties of CD96-high Th9 cells.","method":"Single-cell transcription profiling; CD96high/low subset transfer into Rag1-/- mice; anti-CD96 blockade in vivo","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — cell transfer and blockade experiments with defined phenotypic readout; multiple methods in single lab","pmids":["29531070"],"is_preprint":false},{"year":2018,"finding":"Anti-CD96 mAbs that block CD96-CD155 interactions (binding to first Ig domain) retain anti-metastatic activity dependent on CD155 and partially on IL-12p35, while a mAb binding the second Ig domain (8B10) that does not block CD155 retains anti-metastatic activity in CD155-deficient mice. All anti-CD96 clones were inactive in CD226-deficient mice, placing CD226 as required downstream of CD96 blockade for NK cell anti-metastatic activity.","method":"Comparative mAb binding-domain mapping by flow cytometry; experimental and spontaneous metastasis models; CD155-/-, IL-12p35-/-, CD226-/- epistasis mouse models","journal":"Oncoimmunology","confidence":"High","confidence_rationale":"Tier 2 — multiple mAbs with defined epitopes, multiple genetic KO epistasis models, replicated across five metastasis models","pmids":["29721390"],"is_preprint":false},{"year":2023,"finding":"Macrophages from giant cell arteritis (GCA) patients retain the CD96 ligand CD155 in the endoplasmic reticulum and fail to bring it to the cell surface; this creates CD155-low antigen-presenting cells that expand CD4+CD96+ T cells that produce IL-9 and become tissue-invasive. In a humanized mouse model, recombinant IL-9 caused vessel wall destruction while anti-IL-9 antibodies suppressed vasculitic lesions, placing the CD155-CD96 checkpoint upstream of Th9 differentiation and vascular inflammation.","method":"Patient-derived macrophage analysis; humanized mouse model of GCA; cytokine manipulation with recombinant IL-9 and anti-IL-9 antibody","journal":"Cell reports. Medicine","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway identified with patient samples and humanized animal model; single lab with multiple methods","pmids":["37075705"],"is_preprint":false},{"year":2022,"finding":"Tumor cell-intrinsic CD96 enhances mitochondrial fatty acid β-oxidation via the CD155-CD96-Src-Stat3-Opa1 signaling pathway, promoting chemoresistance in breast cancer stem cells; in vivo inhibition of cancer cell-intrinsic CD96 enhanced chemotherapeutic response in a patient-derived tumor xenograft model.","method":"CD96 inhibition in patient-derived xenograft; pathway analysis identifying CD155-CD96-Src-Stat3-Opa1 axis; mitochondrial fatty acid β-oxidation assay","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 — pathway mechanistically defined with in vivo xenograft and biochemical assays; single lab","pmids":["36581470"],"is_preprint":false},{"year":2007,"finding":"CD96 is expressed on the majority of CD34+CD38- AML leukemic stem cells but rarely on normal hematopoietic stem cells; CD96+ AML cells (not CD96- cells) showed significant engraftment in bone marrow of irradiated recipient mice in 4/5 samples, demonstrating that CD96 marks cells with leukemic stem cell functional activity.","method":"FACS sorting of CD96+ and CD96- AML fractions; xenotransplantation into irradiated newborn Rag2-/-γc-/- mice","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — functional stem cell assay with xenotransplantation; replicated across 5 patient samples","pmids":["17576927"],"is_preprint":false}],"current_model":"CD96 is an immunoglobulin superfamily transmembrane receptor expressed on T cells and NK cells that binds CD155 (PVR/necl-5) and nectin-1 via its first Ig-like V-domain (structurally resolved by crystallography) with the downstream Ig domains modulating binding affinity; it acts primarily as an inhibitory checkpoint by competing with activating CD226 for CD155 binding on NK cells and CD8+ T cells, but can also transduce co-stimulatory signals through MEK-ERK in CD8+ T cells, and in tumor cells it promotes chemoresistance via a CD155-CD96-Src-Stat3-Opa1 fatty acid oxidation pathway."},"narrative":{"teleology":[{"year":2007,"claim":"CD96 was established as a cell-surface marker that distinguishes leukemic stem cells from normal hematopoietic stem cells, raising the question of whether CD96 has a functional role beyond lineage marking in hematopoietic malignancy.","evidence":"FACS sorting of CD96+ vs CD96− AML fractions followed by xenotransplantation into Rag2−/−γc−/− mice","pmids":["17576927"],"confidence":"Medium","gaps":["Whether CD96 expression is functionally required for leukemic stem cell engraftment or is merely a surface marker","No signaling mechanism defined in AML cells"]},{"year":2007,"claim":"Human genetic studies established that CD96 mutations cause C (Opitz trigonocephaly) syndrome, and the disease-associated T280M mutation in the third Ig domain abolished cell adhesion and growth activities, demonstrating that CD96 functions as a cell adhesion molecule during development.","evidence":"Human mutation analysis; in vitro cell adhesion and growth assays with mutant CD96","pmids":["17847009"],"confidence":"Medium","gaps":["Single functional readout in vitro; no in vivo rescue or animal model confirmation","Developmental signaling pathway downstream of CD96 adhesion not characterized"]},{"year":2008,"claim":"Domain-mapping experiments resolved that CD96 engages both CD155 and nectin-1 via its first (membrane-distal) Ig-like V-domain, with downstream Ig domains modulating binding affinity, answering the structural basis for ligand recognition and explaining how alternative splicing and the T280M mutation alter binding.","evidence":"Chimeric human/murine CD96 constructs; splice variant characterization; binding assays with domain deletions and point mutations","pmids":["19056733"],"confidence":"High","gaps":["Three-dimensional structural basis of recognition not yet determined at this stage","Functional consequences of splice variant differences on immune cell activity not tested"]},{"year":2014,"claim":"Using Cd96−/− mice, CD96 was definitively shown to function as an inhibitory receptor on NK cells that competes with the activating receptor CD226 for CD155 binding, establishing CD96 as an immune checkpoint that restrains NK cell anti-tumor and anti-metastatic responses.","evidence":"Cd96−/− mice challenged with LPS and experimental metastasis models; binding competition assays; NK cell functional assays","pmids":["24658051"],"confidence":"High","gaps":["Intracellular signaling mechanism downstream of CD96 in NK cells not defined","Whether the inhibitory role extends to T cells not yet tested"]},{"year":2018,"claim":"Structural resolution of the CD96-D1/CD155-D1 complex by X-ray crystallography revealed a conserved lock-and-key interface plus a novel 'ancillary key' motif unique to CD96, explaining how CD96 achieves specific necl-5 recognition and competes with CD226 at a molecular level.","evidence":"X-ray crystallography of CD96-D1 bound to CD155-D1; mutational validation of interface residues; binding assays","pmids":["30528596"],"confidence":"High","gaps":["Structure of full-length CD96 ectodomain with all three Ig domains not determined","How the ancillary key motif affects in vivo binding dynamics not established"]},{"year":2018,"claim":"Anti-CD96 monoclonal antibody mapping showed that blocking the CD96-CD155 interaction at D1 was sufficient for anti-metastatic activity, while a D2-binding non-blocking mAb also retained activity in CD155-deficient mice; all anti-CD96 efficacy required CD226, positioning CD226 as an obligate downstream effector of CD96 checkpoint blockade.","evidence":"Comparative mAb epitope mapping; experimental and spontaneous metastasis models in CD155−/−, IL-12p35−/−, and CD226−/− mice","pmids":["29721390"],"confidence":"High","gaps":["Mechanism by which the D2-binding mAb exerts CD155-independent anti-metastatic activity is unexplained","Whether anti-CD96 therapy acts primarily on NK cells versus T cells in these models is unresolved"]},{"year":2018,"claim":"CD96 was identified as an inhibitory co-signaling receptor on Th9 cells: CD96-high Th9 cells were functionally suppressed while CD96-low Th9 cells exhibited greater IL-9 production and inflammatory tissue-invasive potential, extending the checkpoint function of CD96 beyond NK cells to CD4+ T helper subsets.","evidence":"Single-cell transcription profiling; CD96high/low Th9 subset transfer into Rag1−/− mice; anti-CD96 blockade in vivo","pmids":["29531070"],"confidence":"Medium","gaps":["Intracellular signaling pathway mediating CD96 inhibition of Th9 function not defined","Whether CD155 is the relevant ligand for CD96 on Th9 cells not directly shown"]},{"year":2019,"claim":"Genetic epistasis in tumor models revealed that CD96 functions as an immune checkpoint on CD8+ T cells: Cd96−/− CD8+ T cells mediated superior tumor rejection through a pathway requiring CD226, Batf3-dependent cross-presentation, IL-12, and IFNγ, establishing the immune cell hierarchy downstream of CD96 loss.","evidence":"Cd96−/− mice crossed with Cd226−/−, Batf3−/−, and cytokine-deficient strains; multiple tumor challenge models; CD8+ T cell depletion","pmids":["30894377"],"confidence":"High","gaps":["Direct intracellular signaling mechanism in CD8+ T cells downstream of CD96 engagement not identified","Whether CD96 inhibition operates cell-autonomously in CD8+ T cells versus through altered APC crosstalk"]},{"year":2020,"claim":"CD96 crosslinking on CD8+ T cells was shown to co-stimulate activation, proliferation, and cytokine production via MEK-ERK signaling, revealing a co-stimulatory capacity that contrasts with its checkpoint-inhibitory role observed in NK cells and tumor models, and demonstrating context-dependent signaling downstream of CD96.","evidence":"Anti-CD96 crosslinking assays on human and mouse CD8+ T cells; MEK inhibitor treatment; Cd96−/− mice; flow cytometry for NUR77, T-bet, and cytokines","pmids":["32043568"],"confidence":"Medium","gaps":["Apparent contradiction between co-stimulatory crosslinking data and inhibitory genetic ablation phenotype not resolved","Specific intracellular motif(s) in the CD96 cytoplasmic tail mediating MEK-ERK activation not mapped"]},{"year":2022,"claim":"A tumor cell-intrinsic role for CD96 was uncovered: in breast cancer stem cells, CD96 engagement of CD155 activates a Src-Stat3-Opa1 axis that enhances mitochondrial fatty acid β-oxidation, conferring chemoresistance — expanding CD96 function beyond immune regulation to metabolic reprogramming in tumor cells.","evidence":"CD96 inhibition in patient-derived xenograft; biochemical pathway dissection of CD155-CD96-Src-Stat3-Opa1; mitochondrial FAO assays","pmids":["36581470"],"confidence":"Medium","gaps":["Whether this tumor-intrinsic signaling pathway operates in non-breast cancer contexts","Relationship between immune checkpoint function and tumor-intrinsic CD96 signaling not integrated"]},{"year":2023,"claim":"The CD155-CD96 axis was placed upstream of pathogenic Th9 differentiation in giant cell arteritis: macrophages that retain CD155 intracellularly fail to engage CD96 on CD4+ T cells, leading to unchecked IL-9-producing Th9 expansion and vascular inflammation, providing a disease mechanism linking CD96 ligand availability to autoimmune vasculitis.","evidence":"Patient-derived macrophage analysis; humanized mouse model of GCA; recombinant IL-9 and anti-IL-9 antibody intervention","pmids":["37075705"],"confidence":"Medium","gaps":["Mechanism by which macrophages retain CD155 in the ER not defined","Whether therapeutic targeting of CD96 itself would ameliorate GCA not tested"]},{"year":null,"claim":"The molecular basis for CD96's context-dependent switching between inhibitory and co-stimulatory signaling remains unresolved: the cytoplasmic domain motifs responsible for each output, and whether specific ligand-binding geometries or co-receptor interactions determine signaling polarity, are key open questions.","evidence":"","pmids":[],"confidence":"Low","gaps":["Cytoplasmic tail signaling motifs and adaptor proteins mediating inhibitory versus co-stimulatory outputs not mapped","Full-length ectodomain structure including modulation by Ig domains D2/D3 not solved","No integrative model reconciling NK cell inhibition, CD8+ T cell co-stimulation, and tumor-intrinsic metabolic signaling"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[1,3]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5,8]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,2,4]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,5,6,8,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,11]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[1,3]}],"complexes":[],"partners":["CD155","NECTIN1","CD226"],"other_free_text":[]},"mechanistic_narrative":"CD96 is an immunoglobulin superfamily receptor that functions as a context-dependent immune checkpoint on NK cells, CD8+ T cells, and CD4+ Th9 cells by engaging CD155 (PVR/necl-5) and nectin-1 through its membrane-distal first Ig-like V-domain [PMID:19056733, PMID:30528596, PMID:30759143]. On NK cells, CD96 acts as an inhibitory receptor that competes with the activating receptor CD226 (DNAM-1) for CD155 binding, thereby restraining NK cell cytotoxicity and cytokine production; anti-tumor effects of CD96 blockade in metastasis models require intact CD226 signaling [PMID:24658051, PMID:29721390]. On CD8+ T cells, CD96 exerts a dual role: genetic ablation enhances anti-tumor immunity in a CD226-, Batf3-, and IFNγ-dependent manner, yet crosslinking CD96 can also co-stimulate effector function via MEK-ERK signaling [PMID:30894377, PMID:32043568]. Loss-of-function mutations in CD96 cause C (Opitz trigonocephaly) syndrome, a developmental disorder linked to disrupted cell adhesion mediated by the extracellular domain [PMID:17847009]."},"prefetch_data":{"uniprot":{"accession":"P40200","full_name":"T-cell surface protein tactile","aliases":["Cell surface antigen CD96","T cell-activated increased late expression protein"],"length_aa":585,"mass_kda":65.6,"function":"May be involved in adhesive interactions of activated T and NK cells during the late phase of the immune response. Promotes NK cell-target adhesion by interacting with PVR present on target cells. May function at a time after T and NK cells have penetrated the endothelium using integrins and selectins, when they are actively engaging diseased cells and moving within areas of inflammation","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/P40200/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CD96","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CD96","total_profiled":1310},"omim":[{"mim_id":"612859","title":"T-CELL IMMUNORECEPTOR WITH IMMUNOGLOBULIN AND ITIM DOMAINS; TIGIT","url":"https://www.omim.org/entry/612859"},{"mim_id":"606037","title":"CD96 ANTIGEN; CD96","url":"https://www.omim.org/entry/606037"},{"mim_id":"605039","title":"BOHRING-OPITZ SYNDROME; BOPS","url":"https://www.omim.org/entry/605039"},{"mim_id":"211750","title":"C SYNDROME","url":"https://www.omim.org/entry/211750"},{"mim_id":"173850","title":"POLIOVIRUS RECEPTOR; PVR","url":"https://www.omim.org/entry/173850"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":57.5}],"url":"https://www.proteinatlas.org/search/CD96"},"hgnc":{"alias_symbol":["TACTILE"],"prev_symbol":[]},"alphafold":{"accession":"P40200","domains":[{"cath_id":"2.60.40.10","chopping":"30-137","consensus_level":"high","plddt":82.6684,"start":30,"end":137},{"cath_id":"2.60.40.10","chopping":"145-267","consensus_level":"high","plddt":72.1618,"start":145,"end":267},{"cath_id":"2.60.40.10","chopping":"274-378","consensus_level":"high","plddt":81.5414,"start":274,"end":378}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P40200","model_url":"https://alphafold.ebi.ac.uk/files/AF-P40200-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P40200-F1-predicted_aligned_error_v6.png","plddt_mean":64.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CD96","jax_strain_url":"https://www.jax.org/strain/search?query=CD96"},"sequence":{"accession":"P40200","fasta_url":"https://rest.uniprot.org/uniprotkb/P40200.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P40200/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P40200"}},"corpus_meta":[{"pmid":"12917686","id":"PMC_12917686","title":"P2X4 receptors induced in spinal microglia gate tactile allodynia after nerve injury.","date":"2003","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/12917686","citation_count":1235,"is_preprint":false},{"pmid":"24658051","id":"PMC_24658051","title":"The receptors CD96 and CD226 oppose each other in the regulation of natural killer cell functions.","date":"2014","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/24658051","citation_count":389,"is_preprint":false},{"pmid":"28258695","id":"PMC_28258695","title":"TIGIT and CD96: new checkpoint receptor targets for cancer immunotherapy.","date":"2017","source":"Immunological reviews","url":"https://pubmed.ncbi.nlm.nih.gov/28258695","citation_count":375,"is_preprint":false},{"pmid":"10430952","id":"PMC_10430952","title":"Neurotrophins: peripherally and centrally acting modulators of tactile stimulus-induced inflammatory pain hypersensitivity.","date":"1999","source":"Proceedings of the National Academy of Sciences of the 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multiple orthogonal methods in one study\",\n      \"pmids\": [\"19056733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of CD96 first Ig domain (D1) bound to nectin-like protein-5 (CD155/necl-5) revealed that CD96 recognizes CD155-D1 via a conserved 'lock-and-key' interaction and a novel 'ancillary key' structural motif unique to CD96 that confers specific necl-5 recognition. CD96-D1 is sufficient to mediate robust interaction with necl-5 but not nectin-2.\",\n      \"method\": \"X-ray crystallography; mutational analysis; binding assays\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional mutational validation in a single rigorous study\",\n      \"pmids\": [\"30528596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CD96 mutations cause a form of the C (Opitz trigonocephaly) syndrome; a disease-associated missense mutation (T280M) in CD96 caused loss of cell adhesion and growth activities in vitro, indicating CD96 mediates cell adhesion and growth through its extracellular domain.\",\n      \"method\": \"Human genetic mutation analysis; in vitro cell adhesion and growth assays with mutant CD96 protein\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — human genetic findings linked to in vitro functional assay; single lab, single functional readout\",\n      \"pmids\": [\"17847009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Human nectin-1 directly interacts with human CD96 in vitro; the binding site is on the nectin-1 V-domain at the canonical nectin-nectin interface, with affinity comparable to nectin-1 binding to HSV glycoprotein D but lower than CD96's affinity for CD155. Overexpression of nectin-1 on K562 cells increased susceptibility to NK-92 cytotoxicity.\",\n      \"method\": \"In vitro binding assay; affinity measurements; K562 cell overexpression and NK cytotoxicity assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vitro binding reconstitution with affinity quantification and functional cell assay; single lab\",\n      \"pmids\": [\"30759143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CD96 functions as an immune checkpoint on CD8+ T cells; CD96-deficient CD8+ T cells promoted greater tumor control than CD96-sufficient cells, and this depended on CD226 (DNAM-1), Batf3, IL-12p35, and IFNγ, placing CD96 inhibition upstream of these factors in CD8+ T cell anti-tumor responses.\",\n      \"method\": \"Cd96-/- mouse models; tumor challenge experiments with CD8+ T cell-specific depletion; genetic epistasis with Cd226-/-, Batf3-/-, and cytokine-deficient mice\",\n      \"journal\": \"Cancer immunology research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with defined cellular phenotype and multiple epistasis experiments; replicated across several tumor models\",\n      \"pmids\": [\"30894377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CD96 has co-stimulatory function on CD8+ T cells: crosslinking CD96 on human or mouse CD8+ T cells induced activation, effector cytokine production, and proliferation via the MEK-ERK signaling pathway, and increased NUR77- and T-bet-expressing CD8+ T cells. Antibody blockade or genetic ablation of CD96 on CD8+ T cells impaired transcription factor and cytokine expression in vivo.\",\n      \"method\": \"CD96 crosslinking assay; pharmacological MEK-ERK pathway inhibition; Cd96-/- mice in vivo; flow cytometry for NUR77, T-bet, cytokines\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (crosslinking, pathway inhibition, genetic ablation) in single lab; some apparent contradiction with inhibitory role in NK cells\",\n      \"pmids\": [\"32043568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CD96 expression marks functionally distinct CD8+ T cell subsets: CD96-negative CD8+ T cells represent a population producing both perforin and IFNγ upon stimulation; LPS decreases CD96 expression on CD8+ T cells in vitro, linking inflammatory signals to CD96 downregulation and altered effector function.\",\n      \"method\": \"Flow cytometry; intracellular cytokine/perforin staining; in vitro LPS stimulation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single-method association between CD96 expression and effector function; no direct mechanistic manipulation\",\n      \"pmids\": [\"23272144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CD96 expression in Th9 cells acts as an inhibitory co-signaling receptor: CD96-low Th9 cells displayed greater IL-9 production, enhanced expansion, tissue accumulation, and inflammatory potential (causing colitis in Rag1-/- recipients), while CD96-high Th9 cells were less inflammatory. Blockade of CD96 restored expansion and inflammatory properties of CD96-high Th9 cells.\",\n      \"method\": \"Single-cell transcription profiling; CD96high/low subset transfer into Rag1-/- mice; anti-CD96 blockade in vivo\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell transfer and blockade experiments with defined phenotypic readout; multiple methods in single lab\",\n      \"pmids\": [\"29531070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Anti-CD96 mAbs that block CD96-CD155 interactions (binding to first Ig domain) retain anti-metastatic activity dependent on CD155 and partially on IL-12p35, while a mAb binding the second Ig domain (8B10) that does not block CD155 retains anti-metastatic activity in CD155-deficient mice. All anti-CD96 clones were inactive in CD226-deficient mice, placing CD226 as required downstream of CD96 blockade for NK cell anti-metastatic activity.\",\n      \"method\": \"Comparative mAb binding-domain mapping by flow cytometry; experimental and spontaneous metastasis models; CD155-/-, IL-12p35-/-, CD226-/- epistasis mouse models\",\n      \"journal\": \"Oncoimmunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple mAbs with defined epitopes, multiple genetic KO epistasis models, replicated across five metastasis models\",\n      \"pmids\": [\"29721390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Macrophages from giant cell arteritis (GCA) patients retain the CD96 ligand CD155 in the endoplasmic reticulum and fail to bring it to the cell surface; this creates CD155-low antigen-presenting cells that expand CD4+CD96+ T cells that produce IL-9 and become tissue-invasive. In a humanized mouse model, recombinant IL-9 caused vessel wall destruction while anti-IL-9 antibodies suppressed vasculitic lesions, placing the CD155-CD96 checkpoint upstream of Th9 differentiation and vascular inflammation.\",\n      \"method\": \"Patient-derived macrophage analysis; humanized mouse model of GCA; cytokine manipulation with recombinant IL-9 and anti-IL-9 antibody\",\n      \"journal\": \"Cell reports. Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway identified with patient samples and humanized animal model; single lab with multiple methods\",\n      \"pmids\": [\"37075705\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Tumor cell-intrinsic CD96 enhances mitochondrial fatty acid β-oxidation via the CD155-CD96-Src-Stat3-Opa1 signaling pathway, promoting chemoresistance in breast cancer stem cells; in vivo inhibition of cancer cell-intrinsic CD96 enhanced chemotherapeutic response in a patient-derived tumor xenograft model.\",\n      \"method\": \"CD96 inhibition in patient-derived xenograft; pathway analysis identifying CD155-CD96-Src-Stat3-Opa1 axis; mitochondrial fatty acid β-oxidation assay\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pathway mechanistically defined with in vivo xenograft and biochemical assays; single lab\",\n      \"pmids\": [\"36581470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CD96 is expressed on the majority of CD34+CD38- AML leukemic stem cells but rarely on normal hematopoietic stem cells; CD96+ AML cells (not CD96- cells) showed significant engraftment in bone marrow of irradiated recipient mice in 4/5 samples, demonstrating that CD96 marks cells with leukemic stem cell functional activity.\",\n      \"method\": \"FACS sorting of CD96+ and CD96- AML fractions; xenotransplantation into irradiated newborn Rag2-/-γc-/- mice\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional stem cell assay with xenotransplantation; replicated across 5 patient samples\",\n      \"pmids\": [\"17576927\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CD96 is an immunoglobulin superfamily transmembrane receptor expressed on T cells and NK cells that binds CD155 (PVR/necl-5) and nectin-1 via its first Ig-like V-domain (structurally resolved by crystallography) with the downstream Ig domains modulating binding affinity; it acts primarily as an inhibitory checkpoint by competing with activating CD226 for CD155 binding on NK cells and CD8+ T cells, but can also transduce co-stimulatory signals through MEK-ERK in CD8+ T cells, and in tumor cells it promotes chemoresistance via a CD155-CD96-Src-Stat3-Opa1 fatty acid oxidation pathway.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CD96 is an immunoglobulin superfamily receptor that functions as a context-dependent immune checkpoint on NK cells, CD8+ T cells, and CD4+ Th9 cells by engaging CD155 (PVR/necl-5) and nectin-1 through its membrane-distal first Ig-like V-domain [PMID:19056733, PMID:30528596, PMID:30759143]. On NK cells, CD96 acts as an inhibitory receptor that competes with the activating receptor CD226 (DNAM-1) for CD155 binding, thereby restraining NK cell cytotoxicity and cytokine production; anti-tumor effects of CD96 blockade in metastasis models require intact CD226 signaling [PMID:24658051, PMID:29721390]. On CD8+ T cells, CD96 exerts a dual role: genetic ablation enhances anti-tumor immunity in a CD226-, Batf3-, and IFNγ-dependent manner, yet crosslinking CD96 can also co-stimulate effector function via MEK-ERK signaling [PMID:30894377, PMID:32043568]. Loss-of-function mutations in CD96 cause C (Opitz trigonocephaly) syndrome, a developmental disorder linked to disrupted cell adhesion mediated by the extracellular domain [PMID:17847009].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"CD96 was established as a cell-surface marker that distinguishes leukemic stem cells from normal hematopoietic stem cells, raising the question of whether CD96 has a functional role beyond lineage marking in hematopoietic malignancy.\",\n      \"evidence\": \"FACS sorting of CD96+ vs CD96− AML fractions followed by xenotransplantation into Rag2−/−γc−/− mice\",\n      \"pmids\": [\"17576927\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CD96 expression is functionally required for leukemic stem cell engraftment or is merely a surface marker\", \"No signaling mechanism defined in AML cells\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Human genetic studies established that CD96 mutations cause C (Opitz trigonocephaly) syndrome, and the disease-associated T280M mutation in the third Ig domain abolished cell adhesion and growth activities, demonstrating that CD96 functions as a cell adhesion molecule during development.\",\n      \"evidence\": \"Human mutation analysis; in vitro cell adhesion and growth assays with mutant CD96\",\n      \"pmids\": [\"17847009\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single functional readout in vitro; no in vivo rescue or animal model confirmation\", \"Developmental signaling pathway downstream of CD96 adhesion not characterized\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Domain-mapping experiments resolved that CD96 engages both CD155 and nectin-1 via its first (membrane-distal) Ig-like V-domain, with downstream Ig domains modulating binding affinity, answering the structural basis for ligand recognition and explaining how alternative splicing and the T280M mutation alter binding.\",\n      \"evidence\": \"Chimeric human/murine CD96 constructs; splice variant characterization; binding assays with domain deletions and point mutations\",\n      \"pmids\": [\"19056733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Three-dimensional structural basis of recognition not yet determined at this stage\", \"Functional consequences of splice variant differences on immune cell activity not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Using Cd96−/− mice, CD96 was definitively shown to function as an inhibitory receptor on NK cells that competes with the activating receptor CD226 for CD155 binding, establishing CD96 as an immune checkpoint that restrains NK cell anti-tumor and anti-metastatic responses.\",\n      \"evidence\": \"Cd96−/− mice challenged with LPS and experimental metastasis models; binding competition assays; NK cell functional assays\",\n      \"pmids\": [\"24658051\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular signaling mechanism downstream of CD96 in NK cells not defined\", \"Whether the inhibitory role extends to T cells not yet tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Structural resolution of the CD96-D1/CD155-D1 complex by X-ray crystallography revealed a conserved lock-and-key interface plus a novel 'ancillary key' motif unique to CD96, explaining how CD96 achieves specific necl-5 recognition and competes with CD226 at a molecular level.\",\n      \"evidence\": \"X-ray crystallography of CD96-D1 bound to CD155-D1; mutational validation of interface residues; binding assays\",\n      \"pmids\": [\"30528596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full-length CD96 ectodomain with all three Ig domains not determined\", \"How the ancillary key motif affects in vivo binding dynamics not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Anti-CD96 monoclonal antibody mapping showed that blocking the CD96-CD155 interaction at D1 was sufficient for anti-metastatic activity, while a D2-binding non-blocking mAb also retained activity in CD155-deficient mice; all anti-CD96 efficacy required CD226, positioning CD226 as an obligate downstream effector of CD96 checkpoint blockade.\",\n      \"evidence\": \"Comparative mAb epitope mapping; experimental and spontaneous metastasis models in CD155−/−, IL-12p35−/−, and CD226−/− mice\",\n      \"pmids\": [\"29721390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which the D2-binding mAb exerts CD155-independent anti-metastatic activity is unexplained\", \"Whether anti-CD96 therapy acts primarily on NK cells versus T cells in these models is unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"CD96 was identified as an inhibitory co-signaling receptor on Th9 cells: CD96-high Th9 cells were functionally suppressed while CD96-low Th9 cells exhibited greater IL-9 production and inflammatory tissue-invasive potential, extending the checkpoint function of CD96 beyond NK cells to CD4+ T helper subsets.\",\n      \"evidence\": \"Single-cell transcription profiling; CD96high/low Th9 subset transfer into Rag1−/− mice; anti-CD96 blockade in vivo\",\n      \"pmids\": [\"29531070\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Intracellular signaling pathway mediating CD96 inhibition of Th9 function not defined\", \"Whether CD155 is the relevant ligand for CD96 on Th9 cells not directly shown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genetic epistasis in tumor models revealed that CD96 functions as an immune checkpoint on CD8+ T cells: Cd96−/− CD8+ T cells mediated superior tumor rejection through a pathway requiring CD226, Batf3-dependent cross-presentation, IL-12, and IFNγ, establishing the immune cell hierarchy downstream of CD96 loss.\",\n      \"evidence\": \"Cd96−/− mice crossed with Cd226−/−, Batf3−/−, and cytokine-deficient strains; multiple tumor challenge models; CD8+ T cell depletion\",\n      \"pmids\": [\"30894377\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct intracellular signaling mechanism in CD8+ T cells downstream of CD96 engagement not identified\", \"Whether CD96 inhibition operates cell-autonomously in CD8+ T cells versus through altered APC crosstalk\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"CD96 crosslinking on CD8+ T cells was shown to co-stimulate activation, proliferation, and cytokine production via MEK-ERK signaling, revealing a co-stimulatory capacity that contrasts with its checkpoint-inhibitory role observed in NK cells and tumor models, and demonstrating context-dependent signaling downstream of CD96.\",\n      \"evidence\": \"Anti-CD96 crosslinking assays on human and mouse CD8+ T cells; MEK inhibitor treatment; Cd96−/− mice; flow cytometry for NUR77, T-bet, and cytokines\",\n      \"pmids\": [\"32043568\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Apparent contradiction between co-stimulatory crosslinking data and inhibitory genetic ablation phenotype not resolved\", \"Specific intracellular motif(s) in the CD96 cytoplasmic tail mediating MEK-ERK activation not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A tumor cell-intrinsic role for CD96 was uncovered: in breast cancer stem cells, CD96 engagement of CD155 activates a Src-Stat3-Opa1 axis that enhances mitochondrial fatty acid β-oxidation, conferring chemoresistance — expanding CD96 function beyond immune regulation to metabolic reprogramming in tumor cells.\",\n      \"evidence\": \"CD96 inhibition in patient-derived xenograft; biochemical pathway dissection of CD155-CD96-Src-Stat3-Opa1; mitochondrial FAO assays\",\n      \"pmids\": [\"36581470\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this tumor-intrinsic signaling pathway operates in non-breast cancer contexts\", \"Relationship between immune checkpoint function and tumor-intrinsic CD96 signaling not integrated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The CD155-CD96 axis was placed upstream of pathogenic Th9 differentiation in giant cell arteritis: macrophages that retain CD155 intracellularly fail to engage CD96 on CD4+ T cells, leading to unchecked IL-9-producing Th9 expansion and vascular inflammation, providing a disease mechanism linking CD96 ligand availability to autoimmune vasculitis.\",\n      \"evidence\": \"Patient-derived macrophage analysis; humanized mouse model of GCA; recombinant IL-9 and anti-IL-9 antibody intervention\",\n      \"pmids\": [\"37075705\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which macrophages retain CD155 in the ER not defined\", \"Whether therapeutic targeting of CD96 itself would ameliorate GCA not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular basis for CD96's context-dependent switching between inhibitory and co-stimulatory signaling remains unresolved: the cytoplasmic domain motifs responsible for each output, and whether specific ligand-binding geometries or co-receptor interactions determine signaling polarity, are key open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Cytoplasmic tail signaling motifs and adaptor proteins mediating inhibitory versus co-stimulatory outputs not mapped\", \"Full-length ectodomain structure including modulation by Ig domains D2/D3 not solved\", \"No integrative model reconciling NK cell inhibition, CD8+ T cell co-stimulation, and tumor-intrinsic metabolic signaling\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 2, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 5, 6, 8, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 11]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CD155\",\n      \"NECTIN1\",\n      \"CD226\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}